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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2012
Summary of Company's Stock Option and Restricted Stock Unit Activity | The following table summarizes the Company’s stock option and restricted stock unit activity during the year ended December 31, 2012 (in thousands, except per share amounts):
|  |  |  |  | Stock Options Outstanding |  |  | Restricted Stock Units Outstanding |
|  | Shares Available for Grant |  |  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Number of Units |  |  | Weighted Average Grant Date Fair Value |
Balance at December 31, 2011 |  |  | 7,835 |  |  |  | 9,303 |  |  | $ | 7.12 |  |  |  | 3,713 |  |  | $ | 7.52 |
Authorized |  |  | 5,463 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Granted |  |  | (5,145 | ) |  |  | 1,292 |  |  |  | 5.60 |  |  |  | 2,569 |  |  |  | 5.70 |
Options exercised |  |  | — |  |  |  | (317 | ) |  |  | 2.80 |  |  |  | — |  |  |  | — |
Shares released |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1,663 | ) |  |  | 7.37 |
Forfeited or cancelled |  |  | 2,002 |  |  |  | (1,378 | ) |  |  | 8.57 |  |  |  | (681 | ) |  |  | 6.50 |
Balance at December 31, 2012 |  |  | 10,155 |  |  |  | 8,900 |  |  | $ | 6.83 |  |  |  | 3,938 |  |  | $ | 6.44 |
Summary of Stock Options Outstanding | The following table summarizes information about stock options outstanding as of December 31, 2012 (in thousands, except per share amounts and term):
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value |
Vested and expected to vest |  |  | 8,759 |  |  | $ | 6.84 |  |  |  | 3.2 |  |  | $ | 2,473 |
Exercisable |  |  | 6,823 |  |  |  | 7.03 |  |  |  | 2.4 |  |  |  | 1,879 |
Summary of Restricted Stock Units Outstanding | The following table summarizes information about restricted stock units outstanding as of December 31, 2012 (in thousands, except per share amounts and term):
|  | Number of Shares Underlying Restricted Stock Units |  |  | Weighted Average Remaining Vesting Period (Years) |  |  | Aggregate Fair Value |
Vested and expected to vest |  |  | 3,661 |  |  |  | 1.1 |  |  | $ | 18,563 |

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- Definition Tabular disclosure for schedule of share-based compensation arrangement by stock option and restricted stock unit activity. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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